bump sandbox lib version

Author: Hermanya

examples/sandbox/package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "react": "^16.4.1",
     "react-dom": "^16.4.1",
-    "react-landing-page": "^1.0.1",
+    "react-landing-page": "^2.0.2",
     "react-scripts": "1.1.4",
     "rebass": "^2.1.0",
     "styled-components": "^3.0.0"